I had a pond once. With a nice waterfall. I was into bonsai then and flowers. I had koi and guppies. Raccoons were the pond's nemesis although my daughter (4 yrs old then) loved to get up in the middle of the night and watch the beast wash it's hands when he was eating my prized koi. So I built a deep covered pool off the main pool so they could hide and he couldn't reach them. It worked fairly well. I love your set up here. Lots of places for flowers and orchids. Nice.